linkers: Drop -pie on macOS
linkers: Drop -pie on macOS

Projects that specify b_pie=true clutter build logs with the warning:

  clang: warning: argument unused during compilation: '-pie' [-Wunused-command-line-argument]

No option is needed to produce PIE binaries because ld64 is making PIE
executables on 10.7 and above by default, as documented in ld(1).

Signed-off-by: Roman Bolshakov <e9c94dff02085feaa10f4659102d5bd952cb2e61@yadro.com>

jpakkane/meson,QuLogic/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,jpakkane/meson,pexip/meson,jpakkane/meson,QuLogic/meson,QuLogic/meson,pexip/meson,QuLogic/meson,jpakkane/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,pexip/meson,pexip/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,mesonbuild/meson,jpakkane/meson